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Noticed that's a Customer pay RO. Did toyota not stand behind their product @ 70k? Seen a lot stranger things paid by the factory outside of "normal" warranty parameters. I know this is from way back... Just curious.
Got all nostalgic over that old school ADP layout too.
https://forum.ih8mud.com/60-series-wagons/346362-oil-galley-plug-fixes.html#post5103955I need to do this fix on 2 of my 60's. I have read all the threads I can find and I have decided I would really rather not re-drill the hole or remove the head bolt. Can someone confirm the optimum size tap and plug to use WITHOUT re-drilling the factory gallery plug hole? I really don't want to introduce the number of shavings into the head that high speed drilling would produce, even if I did remove the head bolt and stuff the hole, purge the gallery with the engine running or take other remedial measures.
I have read everything from 6mm to 8mm to 5/16, even some other sizes. Looking for the best diameter as well as thread count.